Usage instructions

The full options are not shown in the plugin without viewing the source, so for reference here they are:

-a Additional parameters to send to openssl, like: -a “-servername www.example.com”
-c Critical value to alert on (days until expiration) like: -c 14
-h Help
-H Host (IP or domain name to connect to) like: -H www.example.com
-o Openssl binary path, like: -o /usr/bin/openssl
-p Optional port number (default 443) like: -p 443
-v Verbose
-V Version
-w Warning value to alert on (days until expiration) like: -c 21